<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style>
        body {
            background: linear-gradient(to left, red, green, blue, pink, yellow, lime, black, #ccc, #fff, #eee, #f60, #f0f, #e4bb16, gold, #e416dd, #16a8e4, #e43816);
        }
    </style>

</head>

<body>
    <script>
        // w = window.innerWidth
        // h = window.innerHeight
        // setInterval(function () {
        //     var img = document.createElement("img")
        //     var size = Math.floor(Math.random() * (100 - 1 + 1) + 1)
        //     img.src = "xingxing.png"
        //     img.style.width = size + "px"
        //     img.style.position = "absolute"
        //     img.style.left = Math.floor(Math.random() * (w - size)) + "px"
        //     img.style.top = Math.floor(Math.random() * (h - size)) + "px"
        //     document.body.appendChild(img)
        // }
        // , 100)



        // function fn(str) {
        //     str.slice(4, 8)
        //     str.slice(9)
        // }
        // fn("aefkms;efse'fwefewdffef")


        
    </script>
</body>

</html>